Throttle Actuator “A” (TAC) is located above or in front of the engine. This actuator is controlled by the PCM (Powertrain Control Module) via a voltage signal. The throttle motor opens and closes the throttle plate, thus allowing the required amount of air to pass through, as requested by the driver.
To adjust the actuator signal, the PCM receives electrical inputs from the coolant temperature, intake air temperature, A/C pressure sensors, and engine speed.
Storing the P2103 OBD2 fault code occurs because the PCM detected that the Throttle Actuator “A” circuit has excessively high voltage signals.